1 /* 2 * arch/arm/include/asm/memory.h 3 * 4 * Copyright (C) 2000-2002 Russell King 5 * modification for nommu, Hyok S. Choi, 2004 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * Note: this file should not be included by non-asm/.h files 12 */ 13 #ifndef __ASM_ARM_MEMORY_H 14 #define __ASM_ARM_MEMORY_H 15 16 #include <linux/compiler.h> 17 #include <linux/const.h> 18 #include <mach/memory.h> 19 #include <asm/sizes.h> 20 21 /* 22 * Allow for constants defined here to be used from assembly code 23 * by prepending the UL suffix only with actual C code compilation. 24 */ 25 #define UL(x) _AC(x, UL) 26 27 #ifdef CONFIG_MMU 28 29 /* 30 * PAGE_OFFSET - the virtual address of the start of the kernel image 31 * TASK_SIZE - the maximum size of a user space task. 32 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area 33 */ 34 #define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET) 35 #define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(0x01000000)) 36 #define TASK_UNMAPPED_BASE (UL(CONFIG_PAGE_OFFSET) / 3) 37 38 /* 39 * The maximum size of a 26-bit user space task. 40 */ 41 #define TASK_SIZE_26 UL(0x04000000) 42 43 /* 44 * The module space lives between the addresses given by TASK_SIZE 45 * and PAGE_OFFSET - it must be within 32MB of the kernel text. 46 */ 47 #define MODULES_END (PAGE_OFFSET) 48 #define MODULES_VADDR (MODULES_END - 16*1048576) 49 50 #if TASK_SIZE > MODULES_VADDR 51 #error Top of user space clashes with start of module space 52 #endif 53 54 /* 55 * The XIP kernel gets mapped at the bottom of the module vm area. 56 * Since we use sections to map it, this macro replaces the physical address 57 * with its virtual address while keeping offset from the base section. 58 */ 59 #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff)) 60 61 /* 62 * Allow 16MB-aligned ioremap pages 63 */ 64 #define IOREMAP_MAX_ORDER 24 65 66 #else /* CONFIG_MMU */ 67 68 /* 69 * The limitation of user task size can grow up to the end of free ram region. 70 * It is difficult to define and perhaps will never meet the original meaning 71 * of this define that was meant to. 72 * Fortunately, there is no reference for this in noMMU mode, for now. 73 */ 74 #ifndef TASK_SIZE 75 #define TASK_SIZE (CONFIG_DRAM_SIZE) 76 #endif 77 78 #ifndef TASK_UNMAPPED_BASE 79 #define TASK_UNMAPPED_BASE UL(0x00000000) 80 #endif 81 82 #ifndef PHYS_OFFSET 83 #define PHYS_OFFSET (CONFIG_DRAM_BASE) 84 #endif 85 86 #ifndef END_MEM 87 #define END_MEM (CONFIG_DRAM_BASE + CONFIG_DRAM_SIZE) 88 #endif 89 90 #ifndef PAGE_OFFSET 91 #define PAGE_OFFSET (PHYS_OFFSET) 92 #endif 93 94 /* 95 * The module can be at any place in ram in nommu mode. 96 */ 97 #define MODULES_END (END_MEM) 98 #define MODULES_VADDR (PHYS_OFFSET) 99 100 #endif /* !CONFIG_MMU */ 101 102 /* 103 * Size of DMA-consistent memory region. Must be multiple of 2M, 104 * between 2MB and 14MB inclusive. 105 */ 106 #ifndef CONSISTENT_DMA_SIZE 107 #define CONSISTENT_DMA_SIZE SZ_2M 108 #endif 109 110 /* 111 * Physical vs virtual RAM address space conversion. These are 112 * private definitions which should NOT be used outside memory.h 113 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 114 */ 115 #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) 116 #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) 117 118 /* 119 * Convert a physical address to a Page Frame Number and back 120 */ 121 #define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT) 122 #define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT) 123 124 #ifndef __ASSEMBLY__ 125 126 /* 127 * The DMA mask corresponding to the maximum bus address allocatable 128 * using GFP_DMA. The default here places no restriction on DMA 129 * allocations. This must be the smallest DMA mask in the system, 130 * so a successful GFP_DMA allocation will always satisfy this. 131 */ 132 #ifndef ISA_DMA_THRESHOLD 133 #define ISA_DMA_THRESHOLD (0xffffffffULL) 134 #endif 135 136 #ifndef arch_adjust_zones 137 #define arch_adjust_zones(node,size,holes) do { } while (0) 138 #elif !defined(CONFIG_ZONE_DMA) 139 #error "custom arch_adjust_zones() requires CONFIG_ZONE_DMA" 140 #endif 141 142 /* 143 * PFNs are used to describe any physical page; this means 144 * PFN 0 == physical address 0. 145 * 146 * This is the PFN of the first RAM page in the kernel 147 * direct-mapped view. We assume this is the first page 148 * of RAM in the mem_map as well. 149 */ 150 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) 151 152 /* 153 * These are *only* valid on the kernel direct mapped RAM memory. 154 * Note: Drivers should NOT use these. They are the wrong 155 * translation for translating DMA addresses. Use the driver 156 * DMA support - see dma-mapping.h. 157 */ 158 static inline unsigned long virt_to_phys(void *x) 159 { 160 return __virt_to_phys((unsigned long)(x)); 161 } 162 163 static inline void *phys_to_virt(unsigned long x) 164 { 165 return (void *)(__phys_to_virt((unsigned long)(x))); 166 } 167 168 /* 169 * Drivers should NOT use these either. 170 */ 171 #define __pa(x) __virt_to_phys((unsigned long)(x)) 172 #define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) 173 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 174 175 /* 176 * Virtual <-> DMA view memory address translations 177 * Again, these are *only* valid on the kernel direct mapped RAM 178 * memory. Use of these is *deprecated* (and that doesn't mean 179 * use the __ prefixed forms instead.) See dma-mapping.h. 180 */ 181 #ifndef __virt_to_bus 182 #define __virt_to_bus __virt_to_phys 183 #define __bus_to_virt __phys_to_virt 184 #endif 185 186 static inline __deprecated unsigned long virt_to_bus(void *x) 187 { 188 return __virt_to_bus((unsigned long)x); 189 } 190 191 static inline __deprecated void *bus_to_virt(unsigned long x) 192 { 193 return (void *)__bus_to_virt(x); 194 } 195 196 /* 197 * Conversion between a struct page and a physical address. 198 * 199 * Note: when converting an unknown physical address to a 200 * struct page, the resulting pointer must be validated 201 * using VALID_PAGE(). It must return an invalid struct page 202 * for any physical address not corresponding to a system 203 * RAM address. 204 * 205 * page_to_pfn(page) convert a struct page * to a PFN number 206 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * 207 * pfn_valid(pfn) indicates whether a PFN number is valid 208 * 209 * virt_to_page(k) convert a _valid_ virtual address to struct page * 210 * virt_addr_valid(k) indicates whether a virtual address is valid 211 */ 212 #ifndef CONFIG_DISCONTIGMEM 213 214 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET 215 216 #ifndef CONFIG_SPARSEMEM 217 #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr)) 218 #endif 219 220 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 221 #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) 222 223 #define PHYS_TO_NID(addr) (0) 224 225 #else /* CONFIG_DISCONTIGMEM */ 226 227 /* 228 * This is more complex. We have a set of mem_map arrays spread 229 * around in memory. 230 */ 231 #include <linux/numa.h> 232 233 #define arch_pfn_to_nid(pfn) PFN_TO_NID(pfn) 234 #define arch_local_page_offset(pfn, nid) LOCAL_MAP_NR((pfn) << PAGE_SHIFT) 235 236 #define pfn_valid(pfn) \ 237 ({ \ 238 unsigned int nid = PFN_TO_NID(pfn); \ 239 int valid = nid < MAX_NUMNODES; \ 240 if (valid) { \ 241 pg_data_t *node = NODE_DATA(nid); \ 242 valid = (pfn - node->node_start_pfn) < \ 243 node->node_spanned_pages; \ 244 } \ 245 valid; \ 246 }) 247 248 #define virt_to_page(kaddr) \ 249 (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr)) 250 251 #define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < MAX_NUMNODES) 252 253 /* 254 * Common discontigmem stuff. 255 * PHYS_TO_NID is used by the ARM kernel/setup.c 256 */ 257 #define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT) 258 259 /* 260 * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory 261 * and returns the mem_map of that node. 262 */ 263 #define ADDR_TO_MAPBASE(kaddr) NODE_MEM_MAP(KVADDR_TO_NID(kaddr)) 264 265 /* 266 * Given a page frame number, find the owning node of the memory 267 * and returns the mem_map of that node. 268 */ 269 #define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn)) 270 271 #ifdef NODE_MEM_SIZE_BITS 272 #define NODE_MEM_SIZE_MASK ((1 << NODE_MEM_SIZE_BITS) - 1) 273 274 /* 275 * Given a kernel address, find the home node of the underlying memory. 276 */ 277 #define KVADDR_TO_NID(addr) \ 278 (((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MEM_SIZE_BITS) 279 280 /* 281 * Given a page frame number, convert it to a node id. 282 */ 283 #define PFN_TO_NID(pfn) \ 284 (((pfn) - PHYS_PFN_OFFSET) >> (NODE_MEM_SIZE_BITS - PAGE_SHIFT)) 285 286 /* 287 * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory 288 * and returns the index corresponding to the appropriate page in the 289 * node's mem_map. 290 */ 291 #define LOCAL_MAP_NR(addr) \ 292 (((unsigned long)(addr) & NODE_MEM_SIZE_MASK) >> PAGE_SHIFT) 293 294 #endif /* NODE_MEM_SIZE_BITS */ 295 296 #endif /* !CONFIG_DISCONTIGMEM */ 297 298 /* 299 * For BIO. "will die". Kill me when bio_to_phys() and bvec_to_phys() die. 300 */ 301 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 302 303 /* 304 * Optional coherency support. Currently used only by selected 305 * Intel XSC3-based systems. 306 */ 307 #ifndef arch_is_coherent 308 #define arch_is_coherent() 0 309 #endif 310 311 #endif 312 313 #include <asm-generic/memory_model.h> 314 315 #endif 316